Light guiding frame with a plurality of guiding tracks

ABSTRACT

A light guiding frame with a plurality of guiding tracks is applied for a backlight module of a display device, wherein the backlight module has at least on kind of lighting member. The light guiding frame includes at least one forked lighting member, a reflection member enclosing the forked lighting member, a light-guide member connecting the forked lighting member and having a predetermined shape. The forked lighting member has a containing portion receiving the light member and a plurality of guiding tracks extending from the containing portion for transmitting a light emitting from the lighting member to the light-guide member. The light-guide member is shaped to meet the particular requirement of line or circle displaying region, and thus goal of low cost by cutting down numerous of the lighting member is achieved.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to light guide. More particularly, the present invention relates to a light guiding frame with a plurality of guiding tracks, which provides kinds of lighting regions, such as a line-shape or a circular shape.

2. Background of the Invention

As consumable electrical goods develop, the backlight modules, which provide lighting, are broadly applied to various fields. Such as a cell phone, a notebook, a screen or a keystroke of a PDA, a Touch-pad, and even a Pointing Sticks.

If there are needs of particular lighting, like a special line or loop taken along a border a display with predetermined shape, they conventionally uses a lighting member, like LEDs, arranged along the display with predetermined shape. However, the way using LEDs needs more ones to spread in the particular positions, so as to the conventional display does not have the cost cutting down. The LEDs usually space an interval from each other instead of arranging in a one-to-one or side-by-side manner, the luminance value of the conventional display cannot evenly processed.

Hence, the prior art improved is required to overcome the disadvantages thereof.

SUMMARY OF INVENTION

The object of the invention is therefore to specify a light guiding frame with a plurality of guiding tracks, provides high luminance, a high uniformity value, lighting following a predetermined shape like a lined-shape or a looped-shape, and a low cost.

According to the invention, this object is achieved by a light guiding frame with a plurality of guiding tracks, is adopted for a backlight module having at least one lighting member. The light guiding frame includes at least one forked lighting member, a reflection member enclosing the forked lighting member, and a light-guide member connecting the forked lighting member and having a predetermined shape. The forked lighting member has a containing portion receiving the lighting member and a plurality of guiding tracks extending from the containing portion, the tracks transmit the light emitting from the lighting member to the light-guide member for lighting with the predetermined shape.

To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention. Examples of the more important features of the invention thus have been summarized rather broadly in order that the detailed description thereof that follows may be better understood, and in order that the contributions to the art may be appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where:

FIG. 1 is a perspective view of a first embodiment of the present invention;

FIG. 2 is a perspective view of a second embodiment of the present invention;

FIG. 3 is a perspective view of a third embodiment of the present invention; and

FIG. 4 is a perspective view of a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring to FIG. 1, the present invention provides a light guiding frame 1 with a plurality of guiding tracks is applied for a backlight module having at least on kind of lighting member 2. The lighting member 2 is LED (Light Emitting Display). The light guiding frame 1 includes at least one forked lighting member 10, a reflection member 11 enclosing the forked lighting member 10, a light-guide member 12 connecting the forked lighting member 10 and having a predetermined shape. The forked lighting member 10 including a containing portion 101 receiving the lighting member 2 and a plurality of tracks 102 extending from the containing portion 101 for transmitting the light emitting from the lighting member 2 to the light-guide member 12. The light-guide member 12 provides a displaying area 5 with a various shape, like a lined-shape and a looped-shape. The reflection member 11 encloses a side surface and further a bottom surface of the light-guide member 12, so as to the light of the lighting member 2 emits outwardly form a top surface of the light-guide member 12 for meeting the high luminance thereof.

The light-guide member 12 includes a plurality of light-guide stripes 120 respectively relative to the tracks 102, and the light transmits and follows a first path 21 for the displaying area 5 with two parallel lines.

With respect to FIG. 2, the light-guide member 12 is in a U shape, and has two first light-guide stripes 121 and a second light-guide stripe 122 connecting the two first light-guide stripes 121; wherein the second light-guide stripe 122 connects with the tracks 102, the two first light-guide stripes 121 respectively have two inner side edges, two outside most of the tracks 102 and the second light-guide stripe 122 together outline an inner triangle, and the two inner side edges has a space “b” formed therebetween and being longer than a bottom line “a” of the inner triangle for the light transmitting effectually by the first path 21 and preventing restrictions from stationary light and optical losses.

Referring to FIG. 2, the second light-guide stripe 122 has a plurality of reflecting faces 3 respectively corresponding to the tracks 102, thus the light transmits and follows a second path 22 for the light evenly spreading in the second light-guide stripe 122. The reflecting faces 3 each includes a variable depth for adjusting a luminous flux thereby, and further includes a plurality of round corners 31 to avoid the light gathering at the corners 31.

The present invention uses the light-guide member 12 to be the light-guide stripes 120 or in a U shape to meet different requirements and decreases the numerous of the lighting member 2 to have a low manufacturing cost.

With respect to FIG. 3, the light-guide member 12 is in a rectangular-frame shape, which has two first light-guide stripes 121, a second light-guide stripe 122 connecting two first ends of the two first light-guide stripes 121, and a third light-guide stripe 123 connecting two second ends of the two first light-guide stripes 121, the two first light-guide stripes 121 respectively have two inner side edges, two outside most of the tracks 102 and the second light-guide stripe 122 together outline an inner triangle, and the two inner side edges has a space “b” formed therebetween and being longer than a bottom line “a” of the inner triangle for the light transmitting effectually by the first path 21 and preventing restrictions from stationary light and optical losses.

Referring to FIG. 3, the third light-guide stripe 123 has a gradual-narrow section 4 formed on a middle thereof to meet high luminance according to a principle of that brightness equals to the luminous flux of per unit cross-section area. When the luminous flux is fixed, the luminance increases as the unit cross-section area decreases.

Shown in FIG. 1 and FIG. 2, numerous of the tracks 102 is two, the two tracks 102 respectively connecting the light-guide stripes 120 or the first light-guide stripes 121 of the U-shaped light-guide member 12 in a one-on-one manner, the light transmits by the first path 21; and furthermore, the second light-guide stripes 122 of the U-shaped light-guide member 12 each has two reflecting faces 3 respectively corresponding to the tracks 102 for the light transmitting by the first path 22.

Shown in FIG. 3, numerous of the tracks 102 is three, wherein two outside most of the tracks 102 respectively connecting the first light-guide stripes 121, and the second light-guide stripe 122 concaves two opposing reflecting faces 3 both corresponding to a middle of the tracks 102 for the light transmitting by the first path 23. The luminous flux of the middle of the tracks 102 can be varied by a width thereof.

Descriptions mentioned above, the present invention with a rectangular frame provides a looped-shape displaying area 5 with high uniformity.

Furthermore, the light-guide member 12 connects at least one forked lighting member 10 to increase the luminance thereof. Referring to FIG. 4, the light-guide member 12 is in a rectangular-frame shape, and numerous of the forked lighting member 10 is two. The two forked lighting member 10 symmetrically dispose on two opposing sides of the rectangular light-guide member 12 and respectively connect the second light-guide stripe 122 and the third light-guide stripe 123. The second light-guide stripe 122 and the third light-guide stripe 123 each has two reflecting faces 3 disposed on two ends thereof and respectively connecting the tracks 102, and the reflecting faces 3 each has a plurality of round corners. As the result, the light transmits both by the first path 21 and the second path 22. The two first light-guide stripes 121 each has a gradual-narrow section 4 in a middle thereof to keep the high uniformity thereof.

The present invention uses the light-guide member 12 with various predetermined shape to meet various displaying area 5, decreases the numerous of the lighting member 2 to get low cost and has the reflecting faces 3 arranged, light uniformly transmits in the light-guide member 12. The present invention further uses more than one lighting member 12, like two, to increase luminance of the light-guide member 12. The present invention should be applied to not only consumable electrical goods but also products for recognizing or indicating.

It should be apparent to those skilled in the art that the above description is only illustrative of specific embodiments and examples of the invention. The invention should therefore cover various modifications and variations made to the herein-described structure and operations of the invention, provided they fall within the scope of the invention as defined in the following appended claims. 

1. A light guiding frame with a plurality of guiding tracks, applied for a backlight module having at least on kind of lighting member, and comprising: at least one forked lighting member including a containing portion receiving the lighting member and a plurality of tracks extending from the containing portion; a reflection member enclosing the forked lighting member; and a light-guide member connecting the forked lighting member and having a predetermined shape.
 2. The light guiding frame of claim 1, wherein the lighting member is a LED.
 3. The light guiding frame of claim 1, wherein the light-guide member includes a plurality of light-guide stripes respectively relative to the tracks.
 4. The light guiding frame of claim 1, wherein the light-guide member is in a U shape, and has two first light-guide stripes and a second light-guide stripe connecting the two first light-guide stripes; wherein the second light-guide stripe connects with the tracks, the two first light-guide stripes respectively have two inner side edges, two outside most of the tracks and the second light-guide stripe together outline an inner triangle, and the two inner side edges has a space formed therebetween and being longer than a bottom line of the inner triangle.
 5. The light guiding frame of claim 4, wherein the second light-guide stripe has a plurality of reflecting faces respectively corresponding to the tracks.
 6. The light guiding frame of claim 5, wherein the reflecting faces each includes a variable depth for adjusting luminous flux thereby.
 7. The light guiding frame of claim 5, wherein the reflecting faces each further includes a plurality of round corners.
 8. The light guiding frame of claim 1, wherein the light-guide member is a rectangular frame, which has two first light-guide stripes, a second light-guide stripe connecting two first ends of the two first light-guide stripes, and a third light-guide stripe connecting two second ends of the two first light-guide stripes.
 9. The light guiding frame of claim 8, wherein the second light-guide stripe connects with the tracks, the two first light-guide stripes respectively have two inner side edges, two outside most of the tracks and the second light-guide stripe together outline an inner triangle, and the two inner side edges has a space formed therebetween and being longer than a bottom line of the inner triangle.
 10. The light guiding frame of claim 9, wherein the second light-guide stripe has a plurality of first reflecting faces respectively corresponding to the tracks, and the third light-guide stripe has a plurality of second reflecting faces respectively disposed on two ends thereof.
 11. The light guiding frame of claim 10, wherein the first and the second reflecting faces each includes a variable depth for adjusting a luminous flux thereby.
 12. The light guiding frame of claim 10, wherein the first and the second reflecting faces each further includes a plurality of round corners.
 13. The light guiding frame of claim 10, wherein the third light-guide stripe has a gradual-narrow section formed on a middle thereof to meet the high uniformity.
 14. The light guiding frame of claim 8, further including two forked lighting member respectively connecting the third light-guide stripe and the third light-guide stripe; the two first light-guide stripes respectively have two inner side edges, two outside most of the tracks and the second light-guide stripe together outline an inner triangle, and the two inner side edges has a space formed therebetween and being longer than a bottom line of the inner triangle.
 15. The light guiding frame of claim 14, wherein the second and the third light-guide stripe each includes a plurality of first reflecting faces respectively corresponding to the tracks.
 16. The light guiding frame of claim 14, wherein the two light-guide stripes each has a gradual-narrow section formed on a middle thereof to meet the high uniformity.
 17. The light guiding frame of claim 1, wherein the reflection member encloses a side surface of the light-guide member.
 18. The light guiding frame of claim 1, wherein the reflection member encloses a bottom surface of the light-guide member. 